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David Miller wrote: > From: Jesper Krogh <jesper@krogh.cc> > Date: Fri, 09 May 2008 23:59:18 +0200 > >> David Miller wrote: >>> From: Jesper Krogh <jesper@krogh.cc> >>> Date: Fri, 09 May 2008 20:32:53 +0200 >>> >>>> When it works I doesnt seem to be able to get it pass 500MB/s. >>> With this card you really need multiple cpus and multiple threads >>> sending data through the card in order to fill the 10Gb pipe. >>> >>> Single connections will not fill the pipe. >> The server is a Sun X4600 with 8 x dual-core CPU's, setup with 64 >> NFS-threads. The other end of the fiber goes into a switch with gigabit >> ports connected to 48 dual-core cpus. The test was done doing a dd on a >> 4.5GB file from the server to /dev/null on the clients. > > A single file transfer will not fill the pipe using this card, no > matter how many cpus you have :-) I do run 20+ times dd on each of the clients at the same time. Using a single client I should be able to get it pass 1 gigabit. (The 4.5 GB file can fit in the 32GB memory of the server so the serverdisk isn't the bottleneck either) Further investigation shows that: # ethtool -k eth4 Offload parameters for eth4: Cannot get device rx csum settings: Operation not supported rx-checksumming: off tx-checksumming: on scatter-gather: on tcp segmentation offload: off udp fragmentation offload: off generic segmentation offload: off Does that seem correct? -- Jesper -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | |||||||||
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